Hi Jo,
Ah yes, there is a 1929 marriage in Montreal for John McFetrick and Eva Mitchell.
I had a quick peek at the Montreal directories,
1964-1965 McFetrick, J. F. (E), emp. BT Co. (BT is Bell Telephone)
1965-1966 McFetrick, Ethel (widow Frank)
Not helpful that they do split years after 1963. I am not seeing an online death for a John/Francis/Frank.
Fingers crossed that something pops up in your boxes or ...................plod plod sip, plod sip sip,
sip sip sip = another success.

Cheers,
DB